[Sirrotica]

Originally Posted by Formulabruce

Gee, had No idea this thread was about racing engines.
Since the old Castrol GTX days, and the reduction in Zinc, and installing 4 OZ extra in my Drivers, I have had no issues. I did get my oil tested a few times as one of my customers was a oil testing facility when I was working. When zddp first was offered, I used it in synthetic oil. At 15,000 miles used, the oil still passed all tests for its certification.
But, like most folks here in the Lobby, I was , and am not "Racing"
Basically speaking ALL current Motor oils from 5 Winter and up to 40 Summer will be 30X better than the non detergent motor oils of old. .

Gee, nobody said anything about only street engines, the topic was flat tappet engines. Flat tappets are used in all kinds of engines last I looked. The example that Driven used to illustrate about additives, and balancing the package. They happened to use 2 race engines because they show wear more rapidly. The point was made that too much ZDDP will cause more wear, not less. There is a point that the additive stops being beneficial, and causes galling and pitting.

The engine doesn't have to be a race engine, but I'm sure the blanket statement that, "you can't use too much ZDDP" made by you was only for street engines. It really doesn't matter as long as it's an IC engine, it applies to all reciprocating engines and wear properties of the oil.

[geeteeohguy]

Originally Posted by Sirrotica

Gee, nobody said anything about only street engines, the topic was flat tappet engines. Flat tappets are used in all kinds of engines last I looked. The example that Driven used to illustrate about additives, and balancing the package. They happened to use 2 race engines because they show wear more rapidly. The point was made that too much ZDDP will cause more wear, not less. There is a point that the additive stops being beneficial, and causes galling and pitting.

The engine doesn't have to be a race engine, but I'm sure the blanket statement that, "you can't use too much ZDDP" made by you was only for street engines. It really doesn't matter as long as it's an IC engine, it applies to all reciprocating engines and wear properties of the oil.

I'll back this up. Too much is detrimental to good lubrication. The secret is in a balanced additive package. The best balanced packages come in ready-to-go oils, not home brew combinations of additives. I have and will continue to run cheap dino diesel spec Rotella or Delo in all my flat tappet cars. Have for years now, and zero issues. Teardown of the 400 in my '67 GTO to do a rear main and reseal 9 years ago at about 90k miles on the rebuild showed rod and main bearings that looked new, with no signs of wear. The engine was also spotless inside with no sludge or varnish. Good enough for me. I installed new gaskets and am running it. Expect to get at least 80k more miles before the next overhaul. The first overhaul was at 173,000 miles in 1988.